Pump



' UNITED STATES PATENT OFFICE.

MARTIN LOUIS, 0F

KIEL, Gummy,

AKTIENGESELLSCHAFT, 01

Application filed 0 The invention ABSIGNOB TO IIBIED. IBUPP GIBKAHIAWEBFT KIEL-GAABDEN, GERMANY.

PUMP.

relates to the control of the capacity of that type of fuel pumps for Diesel engines, in which the plunger 1s actuated during the suction stroke by means 0 a cam disk, whereas during the delivery stroke it is actuated by means of a sprlng.

Two embodiments of the sub ect-matter of the invention are illu ample in drawing Fig. 1 is P p Fig the accompanying forms part of this specification.

forming the first 2 is a similar section through a pump strated by way of exdrawing which In this a longitudinal section through 0 example,

forming the second example.

The embodiment shown in described first.

A denotes a plunger B is plunger adapted to reciprocate. has an extension 6 frame and. is acted upon by an spring H abutting on guide said extension 12 Fig. 1 will be pump casing in which a The which forms a actuating a disk 72 serving to of the plunger.

casing A is provided with a cylindrical bore a into which fits the c end of the extension 6 to the extension b and face 0 D by means of a spring L.

vided with a slide against a cam disk In the casing A the slide theslide face 0 abuts is provided a roller surface of which extends in with the opposite face of the arm orrespondingly shaped An arm C is linked has its free end prowhich is pressed track G garallel when on the cylindrical por- Between the roller arm C is arranged a roller E which is adapted to be shifted by hand or by the intermediary of an actuating rod governor of the engine through the F. M denotes the suction valve and N the delivery valve of the pump.

Upon the cam disk rection of the arrow to, the face a is lifted bythe ascending cam df C executes a rocking motion and the arm D rotating in the diof arm 0 of disk D the fulcrum of which is the point 0 where it is in contact with the roller E, and moves the plunger B to tion stroke fuel enters the cylinder of the p lasts until the face 0 the end of cam d spring H the right. During this sucthrough. the valve M um This movement su denly glides ofi' at In this moment the which had previously been compressed, is relaxed and shifts the plunger B to the left, this bein The fuel is thereby g the delivery stroke. delivered to the fuel The ed to reciprocate ctober 7, 1926, Serial No. 140,195, and in Germany October 81, 1825.

valve (not shown) through valve N. The delivery stroke is limited by the c lindrical end of the portion 1) striking on t e bore a of the casing A. As the air existing in the bore a is hereby displaced, a shock dampmg effect is obtained. By altering the posit1on of the roller E the ratio of transmission of arm C and thus the stroke and the volume delivered by the pump is altered.

The embodiment illustrated in Fig. 2 differs from that already described merely by an air cush1on being provided for instead of spring H. To this end the portion 1) carries a plunger J the cylinder of which is connected to an air vessel K by means of a flange This arrangement is especially adapted to be used with multi-cylinder engines, in which the fuel pumps of all the cylinders may be lodged in a common casing. In this case the cylinders of the plungers J of all the pumps are preferably connected to a common air vessel K. It will further be preferable to fill the air vessel K with a liquid up to a level above the joint of flange k as this joint is easier to be tightened for liquid than for air.

the air vessel in a perceptible degree.

The regulation of the quantity of fuel to be delivered takes place in the same way as described in the embodiment described first.

Claims:

1. In a pump a cylinder,

therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, a two-armed rocking lever, one arm of it co-operating with said cam disk and the other arm engaging said piston to move it in the direction of i suction, means for displacing the fulcrum of said two-armed lever, and a poweraccumulator adapted to act upon said piston in the direction of the pressure stroke.

2. In a pump a cylinder, a piston adapted to reciprocate therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, an extension on said piston, a lever linked to said extension and co-operating with said cam disk, -a displaceable member in contact with said lever on a place located between its fulcrum and the .face engaging said cam disk, and a poweraccumulator adapted to act upon said piston in the direction of the pressure stroke.

Besides a small leakage of liquid will not interfere with the effect of a piston adapt- 3.In a pump a cylinder, a iston adapted to reci rocate therein, an a and a disk and means for rotating it, an extension on said piston, a lever linked to said extension, and co-operating with said cam disk a displaceable roller in contact with said ission valve .lever at a=place located between its fulcrum and the face engaging said cam disk, an abutment for said roller opposite said lever,

means for displacing sald roller along said lever, and a power accumulator adapted to act upon said piston in the direction of the pressure stroke.

4. In a pump a cylinder, a piston adapted to reciprocate therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it an extension on said piston, a lever linke to said extension and co-operating with said cam disk a displaceable roller in contact with said lever at a place located between its fulcrum and the face engaging said cam disk, an abutment for said roller opposite said lever means for displacing said roller along said lever, a power accumulator ada ted to act upon said piston in the direction of the pressure stroke, and means for limitingsald pressure stroke to discharge said roller at the end thereof.

5. In a pump a cylinder, a piston adapted to reciprocate therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, an extension on said piston, a lever linked to said extension and co-operating with said cam disk, a displaceable roller in contact with said lever at a place located between its fulcrum and the face enga 'ng said cam disk, an abut ment for sai roller opposite said lever, means for displacing said roller along said lever, a power accumulator adapted to act upon said piston in the direction of the pressure stroke, a stop face on said piston extension, and an abutment on said cylinder adapted to be struck by said stop face at the end of the pressure stroke.

6. In a pump a cylinder, a piston adapted to reciprocate therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, an extension on said piston, a lever linked to said extension and co-operating with said cam disk, a displaceable roller in contact with said lever at a place located between its fulcrum and the face engaging said cam disk, an abutment for said roller opposite said lever, means for displacing said roller along said lever, a power accumulator adapted to act upon said piston in the direction of the pressure stroke, means for limiting said pressure stroke to discharge said roller during this stroke, and means for damping the shock arising in said limiting actio 7. In a pump a cylinder, a piston adapted and a ehvery valve on said cyhnder, a cam d to reciprocate therein, an admission valve 4 elivery valve on said cylinder, a cam isk and means for rotating it, an extension on said dpiston, a lever linked to said rxtension an co-operating with said cam disk, 8. displaceable roller in contact with said lever at a place located between its fulcrum and the face engaging said cam disk, an abutment for said roller opposite said lever, means for displacing said roller along said lever, a power accumulator adapted-to act upon said piston in the direction of the pressure stroke, a hollow annular enlargement on said cylinder, and an annular stop face on said piston extension fittin into said enlargement and entering it at t e end of the pressure stroke of said piston.

8. In a pump a cylinder, a iston adapted to reciprocate therein, an a mission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, a two-armed rocking lever, one arm of it co-operating with said cam disk and the other arm engaging said piston to'move it in the direction of suction, means for displacing the fulcrum of said two-armed lever, and an air vessel adapted to act upon said piston in the direction of the pressure stroke.

9. In a pump a cylinder, a piston adapted to reciprocate therein, an admission valve and a elivery valve on said cylinder, a cam disk and means for rotating it, an exten sion on said iston, a lever linked to said extensionan co-operating with said cam disk, a displaceable roller in contact with said lever at a place located between its fulcrum and the face engaging said cam disk, an abutment for said roller 0 posite said lever, means for displacing sai roller along said lever, and an air vessel adapted to act upon said piston in the direction of the pressure stroke.

10. In a pump a cylinder, a piston adapted to reciprocate therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, an extension on said piston, a lever linked to said extension and co-operating with said cam disk, a displaceable roller in contact with said lever at a lace located between its fulcrum and the ace engaging said cam disk, an abutment for said roller opposite said lever, means for displacing said roller along saidlever, an air vessel adapted to act upon said piston in the direction of the pressure stroke, a hollow'annular enlargement on said cylinder, and an annular stop face on said piston extension fitting into said enlargement and entering it at the end.of the pressure stroke of said-piston.

11. In a pump a cylinder,

an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, an extension on said piston, a lever linked to said extension and co-operating with said cam disk, 9. displaceable roller in contact with said lever at a place located between its fulcrum and the face engaging said cam disk, an abutment for said roller opposite said lever, means for displacing said roller along said lever, and an air vessel adapted to act upon said piston in the direction of the pressure stroke, a liquid layer being interposed between said piston and the air contained in said air vessel, in order to tighten the joint existing between the air vessel and the pump.

12. A plurality of fuel pumps for multicylinder internal combustion engines, comprising each a cylinder, a piston adapted to reciprocate therein, an admission valve and a delivery valve on said cylinder, a cam disk and means for rotating it, a two-armed rocking lever, one arm of it co-operating with said cam disk and the other arm engaging said piston to move it in the direction of suction, means for displacing the fulcrum of said two-armed lever, and an air vessel connected to all said cylinders and adapted to act upon said pistons in the direction of the pressure stroke.

The foregoing specification si ned at Berlin, Germany, this 18th day 0 September,

MARTIN LOUIS. 

